题解 | 回文日期

import sys
import datetime
month = [0,31,29,31,30,31,30,31,31,30,31,30,31]

start,end= map(int,sys.stdin.read().splitlines())
count=0
#只用管m和d就可以，y由m,d对称过来就行
for m in range(1,13):
    for d in range(1,month[m]+1):
        y = d%10*1000+d//10*100+m%10*10+m//10
        cur=y*10000+m*100+d
        if start<=cur<=end:
            count+=1
        if y%4==0 and y%100!=0 or y%400==0:
            month[2]=28
        else:
            month[2]=29

print(count)